US9454042B2 - Frame sealant and sealing method, display panel and display device sealed therewith - Google Patents

Frame sealant and sealing method, display panel and display device sealed therewith Download PDF

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US9454042B2
US9454042B2 US14/375,510 US201314375510A US9454042B2 US 9454042 B2 US9454042 B2 US 9454042B2 US 201314375510 A US201314375510 A US 201314375510A US 9454042 B2 US9454042 B2 US 9454042B2
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epoxy resin
water
solvent
frame sealant
substrate
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US20150301369A1 (en
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Xinxing Wang
Jaegeon YOU
Jikai YAO
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/04—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving separate application of adhesive ingredients to the different surfaces to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2401/00—Presence of cellulose
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2463/00—Presence of epoxy resin
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2463/00—Presence of epoxy resin
    • C09J2463/003—Presence of epoxy resin in the primer coating

Definitions

  • An embodiment of the present invention relates to a frame sealant and a sealing method, a display panel and display device sealed with the frame sealant.
  • TFT-LCD is one of Active Matrix-LCD's (AM-LCD's).
  • A-LCD's Active Matrix-LCD's
  • TFT-LCD has advantages on lightness, contrast, energy consume, life cycle, volume and weight. It is highly automatic, low-cost, and suitable for mass production, and it becomes a main product in new century with wide development space.
  • TFT-LCD is formed by cell-assembling a TFT substrate and a color substrate (CF) and filling crystal. To protect the crystal from the contamination of outside environment, a frame sealant has been used to seal the TFT-LCD.
  • CF color substrate
  • thermo-curable frame sealants are mainly classified as thermo-curable one and UV curable ones.
  • the UV curable frame sealant has a short curing time and is fast for curing, but has poor controllability. Moreover, it is not suitable for special display modes, such as polymer dispersed liquid crystals (PDLC) or polymer stabilized cholesteric texture liquid crystals (PSCT), because a polymeric monomer sensitive to UV is contained in the liquid crystal cell, which can be sealed only through the thermo-curable frame sealants.
  • PDLC polymer dispersed liquid crystals
  • PSCT polymer stabilized cholesteric texture liquid crystals
  • Current thermo-curable frame sealants employ an external heat source, resulting in slow curing, long curing time, large energy lost, and a heat conduction gradient from external towards internal occurring during the process of curing.
  • thermo-curable frame sealants are problematic in some aspects, such as uneven sealant breadth, retraction, and breakage. Defective curing would directly affect the quality of the panel, for example, poorly cured panel would present lightness mura in periphery. Therefore, there is a need for an improved thermo-curable frame sealant.
  • An embodiment of the present invention provides a sealing method for a frame sealant, comprising:
  • a first material by which a nano-scale second material is encapsulated is dispersed in the solvent-based epoxy resin, wherein, the first material is a hydrophilic polymeric material and the second material is one which will undergo an exothermic reaction with water.
  • said water-borne epoxy resin and said solvent-based epoxy resin both have a solid content of 60-70 wt %.
  • the first material is an ester or an amide.
  • the first material is a starch or a cellulose.
  • the second material is a nanometer alkaline earth metal oxide.
  • the nanometer alkaline earth metal oxide is a nanometer calcium oxide.
  • the first material and the second material encapsulated by the first material are added in an amount of 10-20% by weight of the solvent-based epoxy resin.
  • a frame sealant comprises a water-borne epoxy resin and a solvent-based epoxy resin
  • a first material by which a nano-scale second material is encapsulated is dispersed in the solvent-based epoxy resin, wherein, the first material is a hydrophilic polymeric material and the second material is one which will undergo an exothermic reaction with water.
  • said water-borne epoxy resin and said solvent-based epoxy resin both have a solid content of 60-70 wt %.
  • the first material is an ester or an amide.
  • the first material is a starch or a cellulose.
  • the second material is a nanometer alkaline earth metal oxide.
  • the nanometer alkaline earth metal oxide is a nanometer calcium oxide.
  • the first material and the second material encapsulated by the first material are added in an amount of 10-20% by weight of the solvent-based epoxy resin.
  • a display panel is sealed through the sealing method for the frame sealant.
  • a display device comprises the display panel.
  • FIG. 1 is a schematic diagram of the substrate coated with the solvent-based epoxy resin according to the embodiment of the present invention
  • FIG. 2 is a schematic diagram of the substrate coated with the solvent-based epoxy resin and the water-borne epoxy resin that is to be pressed according to the embodiment of the present invention
  • FIG. 3 is a schematic diagram of the frame sealant that has been pressed and cured according to the embodiment of the present invention
  • FIG. 4 is a flow chart showing the preparation of the starch-encapsulated nanometer CaO according to the embodiment of the present invention.
  • An embodiment of the present invention provides a sealing method for a frame sealant, comprising:
  • a first material by which a nano-scale second material is encapsulated is dispersed in the solvent-based epoxy resin, wherein, the first material is a hydrophilic polymeric material and the second material is one which will undergo an exothermic reaction with water.
  • An embodiment of the present invention provides a frame sealant comprising a water-borne epoxy resin and a solvent-based epoxy resin,
  • a first material by which a nano-scale second material is encapsulated is dispersed in the solvent-based epoxy resin
  • the first material is a hydrophilic polymeric material and the second material is one which will undergo an exothermic reaction with water.
  • the first material by which the nano-scale second material is encapsulated will be dissolved into the water from the water-borne epoxy resin due to its water-solubility, such that the second material will be exposed to water.
  • the second material will react with water in the form of an exothermic reaction to emit heat, which will cause the curing of the frame sealant.
  • the curing process of the frame sealants of the embodiments of the present invention is caused by an internal heat source, as compared to the frame sealants in the prior art. Thus, it can avoid the energy loss occurring in the prior curing process and increase the curing rate. Further, the second material encapsulated by the first material can be homogeneously dispersed in the solvent-based epoxy resin, and thus enhance the curing uniformity
  • both said water-borne epoxy resin and said solvent-based epoxy resin can have a solid content of 60-70 wt %.
  • the proximity of the solid contents between the water-borne epoxy resin and the solvent-based epoxy resin will avoid poor sealing effect caused by difference in viscosity between them.
  • the first material can be an ester or an amide.
  • the first material can be a starch or a cellulose.
  • the second material is a nanometer alkaline earth metal oxide.
  • the second material can be a nanometer calcium oxide (CaO) or a nanometer magnesium oxide (MgO), preferably nanometer CaO.
  • CaO nanometer calcium oxide
  • MgO nanometer magnesium oxide
  • the first material and the second material encapsulated by the first material are added in an amount of 10-20% by weight of the solvent-based epoxy resin.
  • the addition amount is less than 10 wt %, the heat generated by the reaction of the second material with water is insufficient to cure the epoxy resin.
  • the addition amount is more than 20 wt %, the heat generated by the reaction of the second material with water may be in excess, possibly resulting in an excessive curing such that the cured frame sealant becomes aged.
  • the solvent used in the solvent-based epoxy resin is an organic small molecule material commonly used in the curing of the frame sealant, such as acetone, propyl acetate, methyl amyl ketone, and the like.
  • the frame sealant further comprises other conventional components, such as a catalyst, which will not be described detailedly.
  • the first material is a starch
  • the second material is a nanometer CaO.
  • Nanometer CaO and the starch encapsulating nanometer CaO are added in an amount of 10-20% by weight of the solvent-based epoxy resin.
  • Nanometer CaO encapsulated by the starch is homogeneously dispersed in the solvent-based epoxy resin.
  • the starch When the frame sealant of the embodiment of the present invention is pressed, the starch will be dissolved into the water from the water-borne epoxy resin, such that nanometer CaO will be exposed to water and react with it to generate heat, thereby causing the curing of the frame sealant.
  • Such a curing process can avoid the energy loss occurring in the prior curing process and increase the curing rate as well as curing uniformity.
  • nanometer-scale calcium carbonate can serve as a supporting point to prevent the frame sealant from retracting and breaking, thereby enhancing the formability and strength of the frame sealant.
  • starch is an excellent hydrophilic polymeric material and thus can act as a regulator between water and nanometer CaO, to avoid water to directly contact nanometer CaO and cause a vigorous reaction resulting in a sharp temperature elevation.
  • the solvent-based epoxy resin and the water-borne epoxy resin used are those known by persons skilled in the art for preparing a thermo-curable frame sealant. After reading the specification of the present invention, persons skilled in the art can easily select these solvent-based epoxy resins and water-borne epoxy resins for the purpose of the present invention.
  • a first material by which a nano-scale second material is encapsulated is further dispersed in the solvent-based epoxy resin.
  • Various dispersing processes well-known by persons skilled in the art can be used to disperse the nano-scale second material encapsulated by the first material into the solvent-based epoxy resin.
  • the solvent-based epoxy resin may be HC-1805 available from Mitsui, but is not limited thereto.
  • the water-borne epoxy resin may be BONRON available from Mitsui, but is not limited thereto.
  • a method for preparing the starch-encapsulated nanometer CaO particles will be illustrated below. As shown in FIG. 4 , the method comprises:
  • step a preparing nanometer CaO, to which an anhydrous solvent and a dispersing agent in appropriate amounts are added such that the system becomes an emulsion;
  • step b adding appropriate starch to the emulsion system and stirring the system at a low speed at 80° C. in a water bath until the system become a colloid;
  • step c raising the temperature of the water bath to 120° C. with stirring at a high speed until the system is in the form of suspending particles;
  • step d performing the following procedures to produce starch-encapsulated nanometer CaO particles which are macroscopically in the form of powders: suction filtering, drying, and grinding.
  • the anhydrous solvent comprises anhydrous alcohols, anhydrous ketones, or anhydrous esters.
  • anhydrous alcohols can be an anhydrous ethanol
  • the dispersing agent can be a silane coupling agent KH550.
  • the solvent-based epoxy resin of the embodiment of the present invention in which a second material encapsulated by a first material is dispersed is prepared as follows. At room temperature, anhydrous ethanol, an emulsifying agent, and the starch-encapsulated nanometer CaO are successively charged into a vessel containing the solvent-based epoxy resins. The mixture is treated for 60 min by ultrasonication with vigorous stirring to make it disperse homogeneously. During the process of stirring, the system is warmed to 100° C. at ramp rate of 5° C./min. When a desired viscosity is reached, stirring is stopped and a sample is taken.
  • the emulsifying agent used can be any one which is commonly used in the art for such purpose.
  • the application of the frame sealant of the embodiment of the present invention will be illustrated below, which mainly comprises a coating process and a curing process.
  • a double-funnel equipment is used.
  • a water-borne epoxy resin (BONRON, manufactured by MITSU) is charged into one funnel and a solvent-based epoxy resin prepared according to the embodiment of the present invention is charged into the other funnel.
  • the solvent-based epoxy resin ( 2 ) (as shown in FIG. 1 ) and then the water-borne epoxy resin ( 3 ) (as shown in FIG. 2 ) are coated on the a first substrate ( 1 ), wherein the solvent-based epoxy resin ( 2 ) comprises nanometer CaO ( 202 ) encapsulated by starch ( 201 ).
  • the first substrate ( 1 ) can be first coated with the water-borne epoxy resin ( 3 ) and then coated with the solvent-based epoxy resin ( 2 ).
  • the first substrate ( 1 ) can be coated with the water-borne epoxy resin ( 3 ) (or the solvent-based epoxy resin ( 2 )), and a second substrate ( 4 ) can be coated with the solvent-based epoxy resin ( 2 ) (or the water-borne epoxy resin ( 3 )).
  • the first substrate ( 1 ) and the second substrate ( 4 ) can be any one of the array substrate and the color substrate, and it is not intended that the first substrate ( 1 ) refers to the array substrate or the color substrate.
  • the second substrate ( 4 ) and the first substrate ( 1 ) are aligned and pressed by a flat-plate pressing machine, which has flat rubber gaskets at both sides thereof.
  • a flat-plate pressing machine which has flat rubber gaskets at both sides thereof.
  • the water-borne epoxy resin ( 3 ) and the solvent-based epoxy resin ( 2 ) are admixed with each other.
  • Water in the water-borne epoxy resin ( 3 ) is absorbed by starch. Since the layer of the starch is thin and there is much water, the remaining water after the starch has been saturated will enter the layer of nanometer CaO, where nanometer CaO reacts with water to generate heat.
  • the reacting sites are homogeneously distributed inside the matrix of the epoxy resin, resulting in a homogeneous internal curing.
  • nanometer CaCO 3 shows a cured frame sealant ( 5 ) and the resulting nanometer CaCO 3 ( 501 ).
  • nanometer CaCO 3 can serve as a supporting point to prevent the frame sealant from retracting and breaking, thereby enhancing the formability and strength of the frame sealant.
  • the temperature inside the epoxy resin can be detected through a temperature detector.
  • an external heat source will be opened to supplement heat such that the temperature can arrive at a set temperature such as 150° C. and keep for 1-5 min.
  • the frame sealant is cured homogeneously, with uniform breadth and thinness of sealant.
  • the defects, such as light leak, crystal leak and mura are significantly reduced.
  • the frame sealant also achieved better forming stability and strength. Meanwhile, the resulting liquid crystal display can apply to the display mode that can not use a UV curing.
  • the internal heat source is environmentally friendly, saves energy, imparts a faster curing, and promotes mass production.
  • a frame sealant comprises,
  • a solvent-based epoxy resin said solvent-based epoxy resin comprises nanometer CaO encapsulated by starch, and nanometer CaO is homogeneously dispersed in the solvent-based epoxy resin.
  • a sealing method for the frame sealant comprising:
  • Both said water-borne epoxy resin and said solvent-based epoxy resin have a solid content of 65 wt %.
  • the proximity of the solid contents between the water-borne epoxy resin and the solvent-based epoxy resin will avoid poor sealing effect caused by difference in viscosity between them.
  • the total addition amount of the starch and nanometer CaO encapsulated by it comprises 15% by weight of the solvent-based epoxy resin.
  • the starch When the frame sealant of the embodiment of the present invention is pressed, the starch will be dissolved into the water from the water-borne epoxy resin, such that nanometer CaO will be exposed to water and react with it to generate heat, thereby causing the curing of the frame sealant.
  • Such a curing process can avoid the energy loss occurring in the prior curing process and increase the curing rate as well as curing uniformity.
  • nanometer-scale calcium carbonate can serve as a supporting point to prevent the frame sealant from retracting and breaking, thereby enhancing the formability and strength of the frame sealant.
  • starch is an excellent hydrophilic polymeric material and thus can act as a regulator between water and nanometer CaO, to avoid water to directly contact nanometer CaO and cause a vigorous reaction resulting in a sharp temperature elevation.
  • a method for preparing the starch-encapsulated nanometer CaO particles will be illustrated below. As shown in FIG. 4 , the method comprises:
  • step a preparing nanometer CaO, to which an anhydrous ethanol and a silane coupling agent KH550 in appropriate amounts are added such that the system becomes an emulsion;
  • step b adding appropriate starch to the emulsion system and stirring the system at a low speed at 80° C. in a water bath until the system become a colloid;
  • step c raising the temperature of the water bath to 120° C. with stirring at a high speed until the system is in the form of suspending particles;
  • step d performing the following procedures to produce starch-encapsulated nanometer CaO particles which are macroscopically in the form of powders: suction filtering, drying, and grinding.
  • the solvent-based epoxy resin of the embodiment of the present invention in which a second material encapsulated by a first material is dispersed is prepared as follows. At room temperature, anhydrous ethanol, an emulsifying agent (Monoglycerides HP-C, available from Dupont), and the starch-encapsulated nanometer CaO as prepared above are successively charged into a vessel containing the solvent-based epoxy resins (HC-1850 available from MITSUI). The mixture is treated for 60 min by ultrasonication with vigorous stirring to make it disperse homogeneously. During the process of stirring, the system is warmed to 100° C. at ramp rate of 5° C./min. When a desired viscosity is reached, stirring is stopped and a sample is taken.
  • the application of the frame sealant of the embodiment of the present invention will be illustrated below, which mainly comprises a coating process and a curing process.
  • a double-funnel equipment is used.
  • a water-borne epoxy resin (BONRON, manufactured by MITSU) is charged into one funnel and a solvent-based epoxy resin prepared according to the embodiment of the present invention is charged into the other funnel.
  • the solvent-based epoxy resin ( 2 ) (as shown in FIG. 1 ) and then the water-borne epoxy resin ( 3 ) (as shown in FIG. 2 ) are coated on the a first substrate ( 1 ), wherein the solvent-based epoxy resin ( 2 ) comprises nanometer CaO ( 202 ) encapsulated by starch ( 201 ).
  • the first substrate ( 1 ) can be first coated with the water-borne epoxy resin ( 3 ) and then coated with the solvent-based epoxy resin ( 2 ).
  • the first substrate ( 1 ) can be coated with the water-borne epoxy resin ( 3 ) (or the solvent-based epoxy resin ( 2 )), and a second substrate ( 4 ) can be coated with the solvent-based epoxy resin ( 2 ) (or the water-borne epoxy resin ( 3 )).
  • the second substrate ( 4 ) and the first substrate ( 1 ) are aligned and pressed by a flat-plate pressing machine, which has flat rubber gaskets at both sides thereof.
  • a flat-plate pressing machine which has flat rubber gaskets at both sides thereof.
  • the water-borne epoxy resin ( 3 ) and the solvent-based epoxy resin ( 2 ) are admixed with each other.
  • Water in the water-borne epoxy resin ( 3 ) is absorbed by starch. Since the layer of the starch is thin and there is much water, the remaining water after the starch has been saturated will enter the layer of nanometer CaO, where nanometer CaO reacts with water to generate heat.
  • the reacting sites are homogeneously distributed inside the matrix of the epoxy resin, resulting in a homogeneous internal curing.
  • nanometer CaCO 3 shows a cured frame sealant ( 5 ) and the resulting nanometer CaCO 3 ( 501 ).
  • nanometer CaCO 3 can serve as a supporting point to prevent the frame sealant from retracting and breaking, thereby enhancing the formability and strength of the frame sealant.
  • the temperature inside the epoxy resin can be detected through a temperature detector.
  • an external heat source will be opened to supplement heat such that the temperature can arrive at a set temperature such as 150° C. and keep for 1-5 min.
  • the frame sealant is cured homogeneously, with uniform breadth and thinness of sealant.
  • the defects, such as light leak, crystal leak and mura are significantly reduced.
  • the frame sealant also achieved better forming stability and strength. Meanwhile, the resulting liquid crystal display can apply to the display mode that can not use a UV curing.
  • the internal heat source is environmentally friendly, saves energy, imparts a faster curing, and promotes mass production.
  • a second example is substantively the same as the first example, except that both said water-borne epoxy resin and said solvent-based epoxy resin have a solid content of 60 wt % and the addition amount of starch and nanometer CaO is 10 wt %.
  • a third example is substantively the same as the first example, except that both said water-borne epoxy resin and said solvent-based epoxy resin have a solid content of 70 wt % and the addition amount of starch and nanometer CaO is 20 wt %.
  • the curing of the frame sealant is also performed through an internal heat source similar to the example using starch-encapsulated nanometer CaO, which will not be stated detailedly.
  • An example of the present invention further provides a display panel, which is sealed through the sealing method of the frame sealant.
  • An example of the present invention further provides a display device comprising the display panel.
  • the display device can be selected from the group consisting of: a liquid crystal display panel, an organic light emitting diode (OLED) panel, a cell phone, a tablet PC, a TV, a display, a laptop, a digital photo frame, a navigator, electric paper, and any display product or device which has cell-assembled substrates.
  • OLED organic light emitting diode

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
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CN104119810B (zh) 2013-04-25 2016-06-08 京东方科技集团股份有限公司 封框胶及其封合方法、显示面板及显示装置
JP6187351B2 (ja) * 2014-03-27 2017-08-30 豊田合成株式会社 電池モジュールおよびその製造方法
CN104409655B (zh) * 2014-11-24 2020-01-03 北京大学包头创新研究院 有机发光二极管器件封装干燥剂及其封装应用方法
CN105785666B (zh) * 2016-05-19 2019-03-15 京东方科技集团股份有限公司 封框胶组合物、对盒方法和显示面板
WO2018042884A1 (ja) * 2016-08-30 2018-03-08 パナソニックＩｐマネジメント株式会社 光学デバイス及び光学デバイスの製造方法
CN106848094A (zh) 2017-01-19 2017-06-13 深圳市华星光电技术有限公司 Oled封装方法
CN108546497B (zh) * 2018-05-09 2020-12-01 常州市华菱新材料有限公司 一种自干型环氧涂料及其制备方法与使用方法
CN111892847A (zh) * 2020-07-24 2020-11-06 安徽江锐新材料有限公司 一种提高干燥速率的水性丙烯酸氨基清漆及其制备方法

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